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Hi David,
The same thing happened to my B1200 blocking filter last year, I think it was about 3yrs old as well. I sent an email to Rikki Hocking at Lunt with some photos asking for suggestions on how to clean it. She told me to send it back & they would clean it or replace the glass. I was amazed at the turn around time, it came back looking brand new within a couple of weeks with no charge even though I had no proof of date of purchase. I couldn't fault their customer service & would recommend Lunt equipment in an instant. If you have an issue with your supplier contact Rikki & she will sort it out for you.
Cheers,
Kim
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